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Duma's Method - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main
Quick Facts
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Duma's Method is considered one the most difficult concept.
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5 Questions around this concept.
Solve by difficulty
Given below are two statements I and II.
Statement I : Dumas method is used for estimation of “Nitrogen” in an organic compound.
Statement II : Dumas method involves the formation of ammonium sulphate by heating the organic compound with conc H2SO4.
In the light of the above statements, choose the correct answer from the options given below
Concepts Covered - 1
Duma's Method
The nitrogen containing organic compound, when heated with copper oxide in an atmosphere of carbon dioxide, yields free nitrogen in addition to carbon dioxide and water.
Traces of nitrogen oxides formed, if any, are reduced to nitrogen by passing the gaseous mixture over a heated copper gauze. The mixture of gases so produced is collected over an aqueous solution of potassium hydroxide which absorbs carbon dioxide. Nitrogen is collected in the upper part of the graduated tube as shown in the figure.
Let the mass of organic compound = mg
Volume of nitrogen collected = V1 mL
Room temperature = T1K
Where p1 and V1 are the pressure and volume of nitrogen, p1 is different from the atmospheric pressure at which nitrogen gas is collected. The value of p1 is obtained by the relation;
p1 = Atmospheric pressure – Aqueous tension
22400 mL N2 at STP weighs 28g.
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